Need reviewers - 3 bugs

[Kelly O'Hair]

Need a reviewer.

The jhat change is from keith.randall at gmail.com. I wasn't able to
come up with a testcase for that change.

The other two just fix a couple of broken tests and remove them from
the ProblemList.

6892742: Improve root set used by jhat
6902323: Fix testcase sun/tools/native2ascii/NativeErrors.java
6902325: Fix testcase sun/tools/jhat/HatHeapDump1Test.java

http://cr.openjdk.java.net/~ohair/openjdk7/jdk7-tl-jhat-6892742/webrev/

-kto